It wouldn’t be worth the effort vs the personal health hazard. The hydrocarbon content of the air in the Bayou Corne area is making residents ill. A salt dome containing 1.5 million barrels of liquid butane will be liberated to the open air fairly soon. Asphyxiation or explosion is the anticipated consequence.

Just imagine, you could rig a small dome over the methane leak, power a small generator and hook it to a line sync inverter and get paid for free electricity. One ladys fear is another mans treasure.

Exactamento. Gas and electricity generated on-site back out utility power and gas, and you can actually go negative-balance and get paid retail for the gas and electricity you produce. This does happen in some locations, such as southern Ohio, where people sometimes have old, capped-off wellheads in their basements or yards that have just enough residual natural-gas pressure on the casing that they'll flow to a stove or furnace.

Item, if you must sequester CO2 in volume, the best place to do it is in a partially- or mostly-depleted conventional oil reservoir or a high-carbon shale (like the Eagleford in central and south Texas or the Bakken in Montana and North Dakota) that is known to produce liquid hydrocarbons. The CO2 mobilizes kerogen and bitumen in the shale or sand reservoirs enough that it can be migrated, captured and produced.

CO2 flooding is a secondary-production technique practiced for generations now in older oil fields like those being rejuvenated by massive-frac technology in the old Paleozoic trends of the Ohio Valley.